You know, it is hard to figure why they are reluctant to bloom.
Niveum is not particularly hard to flower. If you grow Brachypetalums, niveum will do well for most people.
Then look at Rothschildianum. That is not particularly difficult either. It just blooms differently because it is from a much more different group within Paphiopedilum. Much bigger plants, more light, a bit drier, much larger root system, etc.
So what does that tell me? Well to be honest since so many growers have trouble flowering them after growing them, it could be caused by maturity in terms of plant size. Choice number 2, it takes more light then we think. Lastly, choice 3, the genes of these two species do not “mesh well” for some reason.
I don’t know what else to say people!!
SHRUG